chore(package): update concurrently to version 5.1.0

Closes #101

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
   "devDependencies": {
     "codecov": "3.5.0",
     "commitizen": "^3.1.1",
-    "concurrently": "^4.0.1",
+    "concurrently": "^5.1.0",
     "cz-conventional-changelog": "^2.1.0",
     "eslint": "^5.16.0",
     "express": "^4.16.4",